Druid or mage? (WoW)?

So i have gotten a rogue to lvl 12 a mage to level 18 and a druid to 13, but i cant decide. The rogue is out of the question now though because i dont want to be stealthing around all the time.. I have been told on the mage that im a fail? I like the druids shapeshifting abilities, but a tauren in robes? looks a little dumb. The mage is a clothie to, the only reason i choose mage is because i thought there spells looked cool. I am going to PvP ALOT, its the most fun thing in the game i think. So druid or mage?